LBP3 is an easy answer. 1 and 2 were great. 3 could have brought a lot of new things to the table thanks to next gen, but instead it added tons of gimmicky elements that didn't improve anything. Plus it had lots of glitches.
Ryse son of rome also comes to mind. If it was just a bit better it could have been a big new franchise for Xbox.
Ryse son of rome also comes to mind. If it was just a bit better it could have been a big new franchise for Xbox.